SharePoint 2010 has native support for tags, this project is not supported any more.
Besides, I am happily not involved in a SharePoint environment anymore, and will happily pass the project to any other interested maintener.

Tagging elements and building a tag cloud is a common feature of modern web sites.

Nuage is a SharePoint solution which makes possible to tag items and display the tag cloud.
The project is an enhancement of CKS tagcloud, it improves performance dramatically
and offer more features.

Features

The "Tags" column can be added on any list (including document libraries) by site administrators

Items can have an illimited number of tags

Users can tag any elements in these lists

The tag cloud shows all tags used in the site collection

What's in the box?

This solution deploys:

a webpart "tag cloud" that displays all tags in the site collection

a webpart "tagged items" which displays all items that belong to a given tag (basically, the one you clocked on the tag cloud) in a layout utterly similar to the results provided by the search engine

As a site collection administrator

Activate the Feature. As a site collection administrator site actions >
Parameters of the site ; Features of the site collection. Activate "Nuage"

In version 1.2.0, you also need to go in Site paramaters >
Galeries > Site columns and open the parameters for "Tags" (the shortcut is to go to
/_layouts/FldEditEx.aspx?field=Tags). In the parameters, specify a delimiter, such as comma or semi-column.

Optionaly, you can create customs columns to have several universes/contextes for the tags. Go to
Site paramaters > Galeries > Site columns and select
Create (the shorcut is to go to /_layouts/fldnew.aspx?Web=1). Create a column of type
single line of text (with tags) and specify a delimiter.

As a site contributor

On the web site, select Site Actions > Parameters. In category
Galeries, select site columns. Select the Tags column (in group Nuage) and fill in the delimiter you want to use between tags.

On a list or document library, select Actions > Parameters. In the "column" section, select
add existing column and add the column Tags

On a page, select Actions > Modify. Add the webpart Nuage-TagCloud and
Nuage-TagBrowser. These two webparts can actually be on different pages, the page that holds the TagBrowser should be mentioned in the parameters of the TagCloud webpart.

Verfication

As a site member

Create or edit a list item. Fill in any tags you want in the "Tags" column.

As a visitor

You'll see all tags used in the site in the tag cloud

Click on any tag to see in the tag browser all the elements tagged as such

Frequent issues (and solutions)

The webpart raises an exception

Our solution is a fork of CKS ; you cannot deploy both solutions at the same time.

I cannot see any tag in the tag browser

In order to optimize the speed, there is a cache. Please wait one hour.

I don't want to wait one hour!

Sure thing. If you want to test, you can reset the application pool.

For a daily use, if you want to reduce the cache, you can set its duration in the web.config

My custom types don't work

If you want to tag a custom type, you need to have a column named "Title".

Indeed, after clicking on a tag, the result webpart displays relevant elements, with their URL, all their tags, and their title. If no title exists, it will fail and show an
ArgumentException: Value does not fall within the expected range

FAQ

Why have you build yet another tagging webpart?

Don't reinvent the wheel, unless

the existing wheel turns out to be slow, in particular with many elements and/or tags. We wanted a solution that can scale reasonably well.

And the scope of the existing tagcloud was limited to the current site. We wanted to have a tag cloud for the whole site collection

Plus it's not totally new, it's a fork from CKS

What does nuage mean?

Nuage means cloud in French.

Where is the source code?

The source code is in the release, in a ZIP file, next to the WSP.
There is one exception: the initial version 1.0.0 was taggued as such in subversion; there is no zip file.

I want to help. What can I do?

It sounds very basic, but you can simply install and test the latest beta release, and help debugging it, reporting
new bugs in the issue tracker